My phones are registered with the CME and i have purchased a Sip trunk . After doing the configuration from my side i am not able to make an outgoing call to the PSTN number through SIP trunk.I am attaching two files :1 Router running configuration2 ...

I am new to VoIP and I have one Cisco catalyst 3750 switch.. in which I have connected three 9971 phones and one 9951phone ,only 3 phones get registered ( 9971 ) but one phone is not taking Vlan ... And when I use command sh cdp neighbor that phone ...